The work aims to comparatively analyze the effects of different corrugation geometry parameters on impact resistance of corrugated rolled titanium/steel composite plates, so as to investigate the impact resistance of corrugated rolled titanium/steel composite plates. A ballistic impact test was conducted on the corrugated rolled titanium/steel composite plate using a first-grade air cannon to fire a spherical projectile. The deflection of the composite plate was calculated using digital image correlation technology to compare and analyze the deformation characteristics and damage mechanisms of the titanium/steel composite plate under ballistic impact. A numerical simulation model was established using LS-DYNA, and the test results were compared to verify the model's feasibility. The geometric parameters of the corrugation were varied in the numerical simulation model to investigate their effects on the impact resistance of the titanium/steel composite plates. For low-energy impacts, the impact resistance mechanism of the titanium/steel composite plate primarily involved absorbing energy through the plastic deformation of the plate, resulting in plastic pit deformation without delamination at the interfacial bond. When process parameters allow, both increasing the amplitude and reducing the cycle can improve the composite plate impact resistance. This is because the large amplitude and small cycle structure can increase the contact area of the heterogeneous materials of the composite plate, improve the interlayer bonding force, and thus enhance the composite plate's resistance to impact deformation and delamination.